mac80211: move ieee80211_set_freq to utils

It really doesn't belong into the wireless extensions code.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 442a43a..199d641 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -893,7 +893,6 @@
 
 /* wireless extensions */
 extern const struct iw_handler_def ieee80211_iw_handler_def;
-int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freq);
 
 /* STA/IBSS code */
 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata);
@@ -1008,6 +1007,7 @@
 		      int encrypt);
 void ieee802_11_parse_elems(u8 *start, size_t len,
 			    struct ieee802_11_elems *elems);
+int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freq);
 
 #ifdef CONFIG_MAC80211_NOINLINE
 #define debug_noinline noinline